Lock.



UNITED STATES PATENT OEE-TOE.

SAMUEL T. MONTROSE, OE NEW YORK, N. Y., ASSIGNOR OE ONE-HALE To CURTISR. BURNETT AND ONE-FOURTH To ALFRED MONTROSE, OF

NEWARK, NEW JERSEY.

LOCK.

Specification of Letters Patent.

Patented May 14, 1907.

To (1J/Z wil/mn, it may concern.-

Be it known that I, SAMUEL T. MONTROSE, a citizen of the United Statesof America, and a resident of the borough of Manhattan, city, county,and State of New York, have invented certain new and useful Improvementsin Locks, oi' which the following is a Specification.

The present invention relates to locks, and has for its object theproduction of means rendering the picking of the lock eX- tremelydil'licult, if not impossible. To this end the invention ischaracterized by two latches adapted to move in curvilinear paths andhaving intermeshing teeth so as to move in unison.

Other features of construction and combination of parts will appear asthe specification proceeds.

In the accompanying drawings the invention is illustrated in a concreteand preferred form, -but changes of construction may of course be madeand parts omitted without departing from the spirit of the invention.

In the said drawings: Figure 1 is a general view of a lock and door jambwith the parts exposed showing the latch mechanism in its closedposition and locked against retraction, embodying the invention. Fig. 2is a view Similar to Fig. 17 but showing the locking device releasedfrom the latch mechanism. Fig. 3 shows the latch mechanism withdrawn.Fig. 4 is a detached view of the door jamb. Fig. 5 is a detail view inperspective of thc sleeve through which the keyA iis inserted. Fig. 6 isa detail view of the Similar characters of reference indicatecorresponding parts in the diferent'views.

1 indicates a casing of any suitable construction in which is arranged.the latch mechanism 2. Abutting the casing on one side isthe door jamb3. This door jamb is obliquely recessed by being provided preferablywith two divergent curvilinear slots 4 and 5. The latch mechanismtravels in an oblique path and consists preferably of two latches 6 and7 moving in divergent curvilinear paths to engage and disengage with theslots inthe door j amb. The spring 8 engaging with the pin 9.normallykeeps the latch mechanism in its closed position.' In order that the twolatches may move in unison in the same direction back and forth,

there are provided intermeshing teeth` 10 on the said two latches,whereby thelmovement of one causes a corresponding movement of theother.

11 denotes a locking device pivoted at 12 on the casing. This lockingdevice is provided with a slot 13 having a recessed inclined lockingsurface 14 ladapted to engage with the pin or member 15 on the latchmechanism when the latter is in its closed position. A spring 16normally keeps the locking surface in engagement 'with the pin 15 on thelatch mechanism when the latter is in its closed position. It willbenoticed that the parts when in this position are locked and that thelatch mechanism can neither be worked out of the slots in the door jambnor can the latter be sprun away from the latch mechanism as the ob iquesurfaces of the Slots in the Yjamb and the corresponding surfaces of thelatch mechanism are wedged together by reason of the inclined lockingsurface on the locking device.

The latch mechanism can 'be withdrawn from one side of the lock (theinside)by means or" the rotatable spindle 17 which extends through thecasing .and through one of the latches. On this spindle is mounted thedog 18, which, when thel spindle is turned, releases the locking deviceand latch mechanism from each other as shown in Fig. 2. This spindle iscapable of a movement sidewise with the latch mechanism by reason of theslot 19 in the casing so that a subsequent sidewise movement of the saidspindle will withdraw' the latch mechanism, the pin 15 sliding throughthe slot 13 in the locking device. By allowing the dog 18 to engage withthe notch 19a of the locking device the latch mechanism will be held inits open position as shown in Fig. 3. A second notch 20 is provided inthe locking device wherebywhen the dog 18 e'ngagesthis the lockingdevice will be in a position released from the latch mechanism, but thelatter will not be withdrawn. When in this osition,

the closing of the door will cause tie latchl mechanism to move backthereby releasing the dog from the locking device, and, when the latchescoincide with the slots in the door j amb, they will Shoot intoengagement therewith and the locking device will move into position tolock them against retraction. The dog '1'8 is held normally out ofengagement 'with the locking device by means of the IOO key.

spring 21. The latch mechanism can be retracted from the other side ofthe lock (the outside) by means of the key 22. This key is of a peculiarconstruction, being. provided with the bit 23 pivoted at 24 and normallyheld in the position shown in Fig. 6 by means of the spring 25. In thisposition, the comb is almost in alinement with the spindle of theExtending through the casing from the outside is the sleeve 26 providedat one oint with a cut out ortion 26a whereby a edge 27 is formed. III:the key is inserted through this sleeve the bit thereof will be held inalinement With the spindle thereof until the cut out 26a is reached whenthe spring 25 will turn the bit slightly whereby the ledge 27 will beencountered, and the bit will be turned at right angles to the spindle.By turning the key, the latter will .'rst engage the locking devicethereby releasing it from the latch mechanism. The key will thenencounter the shoulder 28 on the latch mechanism, and the latter will bewithdrawn. Of course any number of shoulders may be employed, and acorresponding number of surfaces on the key may be provided.

What is claimed is:

1. In a lock, two latches moving in curvilinear paths, and intermeshingteethon the said latches whereby they move in unison.

2. In a lock, a door jamb having curvilinear slots, two latches movingin curvilinear paths into and out of engagement with the slotsaforesaid, intermeshing teeth on the said latches, means for preventingthe retraction of the latches, and means which when operated actprogressively to release the locking means and to retract the latches.

3. In a lock, a door jamb having curvilinear sl'ots, two latches movingin curvilinear paths into and out of engagement with the slotsaforesaid, intermeshing teeth on the said latches, a member on the latchmechanism, a locking device adapted to engagethe said member when thelatch mechanism is in its closed position, and means for releasing thelocking device and for retracting the latch mechanism from both sides ofthe door.

4. In a lock, a door jamb having two curvilinear slots, two latchesmoving in curvilinear paths into and out of engagement with the slots,intermeshing teeth on the latches, a locking device for the latchmechanism preventing its retraction, and means for releasin the lockingdevice and retracting the latc i mechanism from either side of the door.

5. In a lock, two latches adapted to move in curvilinear paths,intermeshing teeth on the said latches, means for operating one of thelatches from side ofthe door, and means for operating the other of saidlatches from the other side of' the door, whereby both latches can .bemoved in unison from either side of the door. v

6. In a lock, a door jamb having two curvilinear slots, two latchesadapted to move in curvilinear paths into and out of engagement with theslots, intermeshing teeth on the said latches a member on the latchmechanism, a locking device adapted to engage 4with the member on thelatch mechanism when the latter is in its closed position, a dog capableof a rotary movement independent of the latch mechanism and a sidewisemovement with the latch mechanism, which acts. when rotated to lit't thelocking device thereby releasing the latch mechanism from the lockingdevice and when moved sidewise to retract the latches.

7. In a lock, the combination of two latches moving in curvilinear anddivergent paths, intermeshing teeth on the said latches whereby theymove in unison, a locking member stationarily supported having a slotwith a recessed portion, a member on one of the latches normally inengagement with the recessed portion of the slot aforesaid when thelatches are in their closed position, means for normally keeping thelatches in their closed position, a rotatable spindle cxtending from theoutside of the lock through one of the latches and slidably movabletherewith, and a dog mounted on the said spindle, whereby the rotationof the said spindle causes the dog to engage with the locking memberthereby releasing the member carried by one of the latches from therecess in the slot, and whereby a subsequent sidewise movement of thespindle causes the withdrawal of the latches.

S. In a lock, the combination of a door jamb having two obli ue slots,two latches moving in unison in dbh ue paths into engagement with theslots a oresaid, a member on the latch mechanism, a locking deviceadapted to engage with the member on the latch mechanism when the latteris v-in its closed position, a dog capable of a rotary movementindependent of the latch mechanism and a sidewise movement with thelatch mechanism, which acts, when rotated to lift the locking devicethereby releasing the latch mechanism from the locking device, and whenmoved sidewise to retract the latches, and a shoulder on the lockingdevice adapted to engage with the dog to hold the latch mechanism in itsretracted position.

Signed at New York this 14th day of March, 1906.

SAMUEL T. MONTROSE.

Witnesses:

HENRY BEST, AXEL V. BEEKEN.

